Stairway.



JOHNN, COLEMAN, 0F PITTSBURG, PENNSYLVANIA.

STAIRWAY.

Specication o! Letters Patent.

Patented Aug. 31, 1909.

Application led February 24, 190B. Serial. No. 17,388.

T 0 all whom 'it may concern:

Be it known that l, J onx Nevis COLEMAN, a resident of littsburg, in the county of Allegheny and State of Pennsylvania, have invented a -new and useful Improvement in Stan-ways; and l'do hereby declare the following' to be a full, clear, and exact description thereof.

This invention relates to tire-proof stairways, and the object;- i s to provide a stairway of this character which is easy and cheap of construction and which is strong and practically indestructible by heat.

lleretoforefire-proof stair-ways have been constructed of a combination of metal and cement or other fire-proof material.

My invention relates to this class of stairwa'vs and is an improvement upon prior ::tair\\fa vs of this 'character t'or the purpose of cheapening the construction and rendering' the same more thoroughly imtestructible by heat. l

The invention comprises the arrangement and combination of parts hereinafter described and claimed. c

In the accompanying drawing Figure 1 is a vertical .section through a portion of a stairway constructed according to my inven tion and taken transversely of the treads and risers; Fig. 2 is a section taken longitudinally through one rf the .steps on the line 2-2, Fig. 1:` aint Fig. -3 is a view similar to Fig. l showing a modification.

'hs application is in part a division of my application lita-d .lune 3, 1907, Serial No. 376, 5i), thtl embmliment shown in Figs. l and 2 being similar to one of the embodiments shown in said prior application.

M y improved stairway com rises metal side plates or stringers 1 pre crably reinforce at top and bottom edges by angle bars 2 riveted to said side plates, and adapted to be supported in the building or other structure m any suitable way. The risers 3 are also of metal plates secured to the side plates or stringers' l in any suitable way, such as by means of sections of angle bar 4, or othel; suitable connecting members. Preferably these risers are provided at their upper edges with moldings 5 to form an ornamental isb or nosing for tte tread, said moldings being secured to the top edge of the risers 3 in any suitable way, such as by means of rivets.

The stepsl propel' are formed by a body of 1 is then erected underneath the risers, being 1.1.0

concrete, cement, or similar cementitious` material 7, preferably having the main portion thereof composed of coarse concrete, while the tread portion T is of a finer cement to give the necessary smooth finish; or, if desired, the tread :nay be covered with a slab of any suitable stone or tiles, or given a mosaic or other finish. The concrete body 7 is reinforced Yby suitable metallic members placed therein in any desired way, but pref erably comprising a lurality ot' bars b extending from side pate to side plate and secured to the side plates in any suitable manner. such as by providing the same with bent or hooked ends` t) fitting in holes formed in the horizontal legs of sections of angle bar l1 riveted or otherwise secured to the side plates 1. The bars b may be of any desired cross section and may. if desired. be dcformed. tllat is, otl varyingcrost; section from end to enti. (enerally, howercr, any metallic bar will answer the purpose.

In the form shown in Figs. 1 and 2 the lower edges of the risers are bent, as shown at G, so as to come substantially parallel to the solit, and the lower face of the concrete steps 7 is reinforced by a metallic mesh l2, such as expanded metal or other suit-able metallic mesh, secured to the lower edges of the side plates or stringers 1 and to the bent lower ends 6 of the risers. This mesh is secured to these parts inany suitable. way, such as wiring the same thereto, as indicated at, 13. The sollitl is formed by a layer of plaster 14: which is applied over the metallic mesh 12 and adheres directly to the concrete treads on account. of the latter exuding through the meshes of the expanded metal, or the plaster filling up through the mesh.

1n the modification shown in Fig. 3 the metallic mesh is omitted, the risers 3 extending only slightly below the surfaces ot'` the treads, as shown, and the plaster sollit. in this case being applied directly to the lower face of the concrete steps. ln this modification the concrete of adjacentI steps is directly in contact in the space below the risers, thus giving a continuous or uninterrupted body of concrete from the top to the bottom of the stairway.

In erecting the stairway the side plates 1 and risers 3 are first put in place, at'ter which the mesh 12 is secured to these parts,

in case such mesh is lto be used. Centex-ing located at the' proper height' to form the l located at. the lower edges of the risers and lower face of the steps. The. concrete T is then filled in on top of the centering and into the spaces behind the risers, the tread being 'uiished in any prei'erred way. vAlter the concrete has set, the centering is removed and the plaster sotlit is then applied to the lower surface of the stairway, said plaster in all cases adhering directlxv to the concrete body of the steps, either through the expanded metal or in the absence of the. same.

This construction dispenses with the lnetallic soflits usually employed in this class` of stairways, the soiiit. being a plaster one applied directly to the lower face of the stairway. This considerably eheapeus the construction and atfthe salue time provides` a more durable solit since the plaster is fairl)r indestructible by heal and is also a good heat resisting agent. 'lhe stair-wirt"` therefore, will withstand a much higher heat; than if a metallic sotlit were employed.

1. In a stairway, the con'tbination ofmetallie .sle plates or stringere, risers 'secured at their ends to said side plates. reinforcement members in the spaces behind the risers and secured to the side plates, metallic mesh .said :dde plates, and a body of rcunentitious material in the space behind the risers and elnbedtling the reinforcement'memlmrs- 2.- In a lire-prout stairway, the combinar tion of side plates or stringers, a plurality of risers secured at their ends to said side plates or stringers, a body of eenlentitious matt-rial in the Spaces behind said risers, and cementitious material applied directly to the lower surface of .said cemcntitious material.

3. In a fire-proof stairway, the combina-- tion of .suitable side plates or stringers, a plurality of risers secured at their ends to said side plates or striugers..'metallic bars having' their ends secured to the side plates and striugers behind the. risers, ceuieutitious material filled into the spaces behind said risers and efmiarddingr .said lvetallie members, and plaster applied directly to the lower surface of said eementitious material.

In testimony whereof, I the said Jeux KEVIN Comin-xx, have hereunto set my hand.

JomT comma N.

'itnesses: Ronnrc'r C. To'rl'lcx", J. R. Ketama. 

